Cisco Cisco NM-2V Two Voice Fax Interface Card Slot Network Module Manual Técnica
Cisco IOS Release 12.3(11)T2.
Components Used
The information in this document is based on the following:
Patch Panel for BRI interface port −− For the BRI interface port, you must install an appropriate patch
panel. Patch panels are generally available from multiple cable and network adapter vendors:
panel. Patch panels are generally available from multiple cable and network adapter vendors:
If you are using the digital voice module EM−4BRI−NT/TE, you may, at your sole discretion,
consider using the JPM2194A patch panel from the Black Box Corporation.
consider using the JPM2194A patch panel from the Black Box Corporation.
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The EVM−HD−8FXS/DID baseboard has an RJ−21 connector. The Black Box JPM2194A
patch panel accommodates RJ−11 and RJ−45 combinations possible on Cisco high−density
expansion modules, and offers flexibility for expansion module upgrades (either analog or
digital).
patch panel accommodates RJ−11 and RJ−45 combinations possible on Cisco high−density
expansion modules, and offers flexibility for expansion module upgrades (either analog or
digital).
Note: Mention of non−Cisco products or services is for information purposes only and
constitutes neither an endorsement nor a recommendation.
constitutes neither an endorsement nor a recommendation.
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Impedance Coefficient Settings −− For EVM−HD−8FXS/DID, adjacent ports 0/1, 2/3, 4/5, and 6/7
share the same impedance−coefficient settings within each pair. This pairing is especially important
when you are configuring some ports for DID mode and others for FXS mode. DID installations may
require different impedance selections resulting from off−premises loop characteristics.
share the same impedance−coefficient settings within each pair. This pairing is especially important
when you are configuring some ports for DID mode and others for FXS mode. DID installations may
require different impedance selections resulting from off−premises loop characteristics.
If you change an impedance setting, a message alerts you to the change.
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These impedance settings apply to the baseboard (EVM−HD−8FXS/DID) only−−not to
EM−HDA−8FXS. Setting the impedance on the EM−HDA−8FXS changes only the
impedance for the port being configured.
EM−HDA−8FXS. Setting the impedance on the EM−HDA−8FXS changes only the
impedance for the port being configured.
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Cisco CallManager Support −− Before you can run the High−Density Analog (FXS/DID/FXO) and
Digital (BRI) Extension Module for Voice/Fax (EVM−HD) feature, you must install a voice−enabled
image of Cisco IOS Release 12.3(8)T4, Release 12.3(11)T, or a later release.
Digital (BRI) Extension Module for Voice/Fax (EVM−HD) feature, you must install a voice−enabled
image of Cisco IOS Release 12.3(8)T4, Release 12.3(11)T, or a later release.
When the High−Density Analog (FXS/DID/FXO) and Digital (BRI) Extension Module for
Voice/Fax (EVM−HD) feature is used in a Cisco CallManager network, Release 4.1.2,
Release 4.0.2a SR1, or Release 3.3.5 of Cisco CallManager must be installed.
Voice/Fax (EVM−HD) feature is used in a Cisco CallManager network, Release 4.1.2,
Release 4.0.2a SR1, or Release 3.3.5 of Cisco CallManager must be installed.
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If this feature is used in a Cisco CallManager Express network, Release 3.1 of Cisco
CallManager Express must be installed.
CallManager Express must be installed.
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EM−HDA−8FXS Ring Signal Has a Maximum of 46 Vrms for 1 REN −− FXS ports on the
EM−HDA−8FXS have a ring signal of about 46 Vrms with a 1−REN load. If you increase the voltage
by reprogramming the PCM codec filters, a false ring−trip occurs. The SLIC ring−trip detection point
is determined by the amount of current flowing into the loop, so an increase in voltage increases the
current for a given load. This increase in current causes an undesirable false ring trip at a REN of 1 or
2.
EM−HDA−8FXS have a ring signal of about 46 Vrms with a 1−REN load. If you increase the voltage
by reprogramming the PCM codec filters, a false ring−trip occurs. The SLIC ring−trip detection point
is determined by the amount of current flowing into the loop, so an increase in voltage increases the
current for a given load. This increase in current causes an undesirable false ring trip at a REN of 1 or
2.
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Port Numbering on the EM−HDA−3FXS/4FXO Expansion Module −− If your installation includes
EM−HDA−3FXS/4FXO expansion modules, note that the port numbering on these modules is not
consecutive. One port number is "skipped" in the numbering between the FXO and FXS interfaces.
This is important when you are defining the port numbers. The following list provides an example
port−numbering scheme for FXS and FXO ports on EM−HDA−3FXS/4FXO modules installed in
slots EM0 and EM1.
EM−HDA−3FXS/4FXO expansion modules, note that the port numbering on these modules is not
consecutive. One port number is "skipped" in the numbering between the FXO and FXS interfaces.
This is important when you are defining the port numbers. The following list provides an example
port−numbering scheme for FXS and FXO ports on EM−HDA−3FXS/4FXO modules installed in
slots EM0 and EM1.
EM0 −− FXS ports 2/0/8, 2/0/9, 2/0/10
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EM0 −− FXO ports 2/0/12, 2/0/13, 2/0/14, 2/0/15
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EM1 −− FXS ports 2/0/16, 2/0/17, 2/0/18
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EM1 −− FXO ports 2/0/20, 2/0/21, 2/0/22, 2/0/23
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